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SPOOL-TYPE DIRECTIONAL VALVE MECHANISM FOR A TURBINE

When the turbine is started, the pressure of the fluid increases and sleeve 1 is shifted upward, compressing helical spring 2 and occupying the position shown. At this, spool 4 admits fluid under pressure through ports a and d to the servomotor of the check valve. Upon a drop in load and when roller 5 is released, spool 4 is raised to its upper extreme position by helical spring 3, cutting off theā€¦